SAN FRANCISCO (AP) — He was the funniest guy in the room, something that made it all the harder for friends and fans to accept that beneath that reservoir of frenetic energy and seemingly endless good humor resided demons so dark they could push Robin Williams to suicide. [...] word that he had killed himself Monday at his San Francisco Bay Area home left both friends in the Hollywood community and neighbors in the quiet neighborhood of Tiburon that he called home equally stunned and grief-stricken. Shortly before noon, the Sheriff's Department received an emergency call from the home, where the star of "Good Will Hunting," ''Mrs.